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Half-hourly metering (HHM) in England refers to the collection of electricity consumption data every 30 minutes, rather than through traditional monthly or quarterly meter readings. Around half of electricity meters in England now effectively support half-hourly data, largely due to the rollout of smart meters and the mandatory use of HHM for larger business customers.

The purpose of half-hourly metering is to provide a more accurate picture of when electricity is used. This granularity supports a more efficient and flexible energy system by aligning consumption with real-time supply conditions. For consumers, especially businesses, HHM can enable more cost-reflective pricing. Customers can shift energy-intensive activities to cheaper periods, such as overnight or times of high renewable generation, reducing bills and carbon emissions.

From a system perspective, half-hourly data helps network operators and suppliers manage demand more effectively. It supports the integration of intermittent renewable energy sources like wind and solar, which require better forecasting and balancing. It also underpins innovative tariffs, demand-side response schemes, and smarter grid planning.

However, challenges remain. Not all households actively engage with half-hourly data, and concerns around data privacy and understanding persist. Ensuring that consumers clearly benefit from half-hourly metering—through fair tariffs, transparency, and protection—remains central to its long-term success in England’s evolving energy market.